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| author | Xin Wu <xinwu@us.ibm.com> | 2017-02-13 19:45:58 -0800 |
|---|---|---|
| committer | Xiao Li <gatorsmile@gmail.com> | 2017-02-13 19:45:58 -0800 |
| commit | 1ab97310e83ee138a1b210c0dfa89a341f1d530a (patch) | |
| tree | d73150111baf59f4c16af65cf4ea8a3c1607ee4e /docs | |
| parent | 6e45b547ceadbbe8394bf149945b7942df82660a (diff) | |
| download | spark-1ab97310e83ee138a1b210c0dfa89a341f1d530a.tar.gz spark-1ab97310e83ee138a1b210c0dfa89a341f1d530a.tar.bz2 spark-1ab97310e83ee138a1b210c0dfa89a341f1d530a.zip | |
[SPARK-19539][SQL] Block duplicate temp table during creation
## What changes were proposed in this pull request?
Current `CREATE TEMPORARY TABLE ... ` is deprecated and recommend users to use `CREATE TEMPORARY VIEW ...` And it does not support `IF NOT EXISTS `clause. However, if there is an existing temporary view defined, it is possible to unintentionally replace this existing view by issuing `CREATE TEMPORARY TABLE ...` with the same table/view name.
This PR is to disallow `CREATE TEMPORARY TABLE ...` with an existing view name.
Under the cover, `CREATE TEMPORARY TABLE ...` will be changed to create temporary view, however, passing in a flag `replace=false`, instead of currently `true`. So when creating temporary view under the cover, if there is existing view with the same name, the operation will be blocked.
## How was this patch tested?
New unit test case is added and updated some existing test cases to adapt the new behavior
Author: Xin Wu <xinwu@us.ibm.com>
Closes #16878 from xwu0226/block_duplicate_temp_table.
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